Conduit fitting



Sept. 4, 1928.

H. A. SELAH CONDUIT FITTING Fil ed April 15, 1925 l/w N705 Aim-M1 Q 3 the box in elevation.

' Patented Sept. 4, z

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invention is designed toimprove conduit fittings and is exemplifiedin theform of a conduit box. It is particularly desir-.

able in relation-to conduit fittings adapted:

5 to engage and connect threadless conduits.

With such devices if. contractible sleeves are' used for engaging a threadless conduit and such sleeves are provided with-slits wh ch extend to the inner end of;the sleeve-the slit lo forms a sharp edge which may'be'objectiomable because of its possibility of cutting the insulation on ihs'erted wires as they drawn over the edge. The present invention provides a collapsible sleeve with alcon I5 tinuous annular inner end so as to prevent any such abrasion, or cutting of the 1nsulation. It is also desirable where such a sleeve is used. to lock the same against rotation.

This can be preferably done with a minimum a0 of material 'by forming flat. or out of round portion in the opening in which; the sleeve s formed so as to engage the sleeve and lock it against rotation. The present.

invention contemplates such a means of engaging such a sleeve. Other features and details of the invention-will appear from the specification-and claims. I V V I The invention is illustrated in the accompanying drawings as follows V b Fig. 1 shows a side elevation of a conduit ox. Fig.2 a section on the line 2 2 in Fig. 1-, the end ipe connections being removed showing t e conduit receiving opening of of the opening on the line Fig. 3 a section 33inFig.1. Y s

Fig. 4 aside elevation of a contractible sleeve.

. Fig. 5 an end view of the same.

Fig. 6; a section on the line 66 4.

-1 marks the-body of the box,-and 2 an extension on the box in which an opening 3 is arranged. The openinghas a tapered end 4 and a sleeve 5 is arranged within the opening. The sleeve hasa ta red end 6 in which flats 7 are arranged and she ta red portion 4 of the o ning 3 is provide with corresponding ats 8 so that when the contractib e sleeve is placed in' the socket the-flats 7 engage the flats 8 and lock the sleeve' against turning but do not in any wa interfere with the contraction of theI-seeve.

. The sleeve is provided with a shoulder 9 and 5g is adapted to receive a threadless c'onduit The sleeve is are opening, the walls preferably provided'with shght ribs 11 which penetratev the insulation'usually found on'a conduit 50 'as toassure an electrical connection between the box and the conduit. Thesle eve isprovided w1th screw threads .12 and a ,nut 13 is arranged at the outer'end ofthejsleeve for drawing the sleeve into the ope i order to make the sleeve readily contractible {provide the axial slit 14 which extends from the outer. end of the sleeve in. wardly. The slitterminates inahori'zbnta slit 15, the horizontal slit extending preferably about half around the -sleeve.. This permits a ready contraction of the sleeve and at the same time afi'ordsla continuous I annulus at the inner end .of the sleeve.

' What I claim as new 1s';-

1. In a'conduit fitting the combination of a body havinga conduit receiving 0 ning thereinyand a. contractible sleeve in the opemng, the walls ofgthe opening and the sleeve having wedging surfaces and a screw thread at itssmaller end, the sur-' faces contracting the sleeve in'to clamping engagement with inserted conduit when thesle'e've is drawn *axially' hro h the action of the-screw and the sleeve havin an 'axialslot extending from its outer. en inwardly and -a circumferential slot extending from the axial slot', theinner of the em}l of the sleeve presenting a continuous wa.-

2. In a conduit fitting, the combination of a body having a conduit receiving opening therein; and a. contractible :sleeve in the v of the opening and the sleeve ha w a 1 and ascrew thread'at its sm er end,;the surfaces the sleeve into clamping ent with an conduit when the eeve through'the action of the serewjnd the sleeve ha an axial slot fi'omits outer en in wardly and a circumferential slot extending 100 from the the inner end of the a sleeve having a'radially inwardly extending guard shoulde'ra continuous inner wall.

3; Ina was. fitting, the combination of ner ends the larger, the 911 11 1 1 f no .4. In a conduit fitting, thecoinbination of: a,body having a conduit receivmg opening? therein; andv a c'ontractible sleeve in the opening, the walls;-of -the opening and the sleeve having wedging surfaces, with. theinner ends the larger, the-smaller end of the sleeve being: screw-threaded, the wedging surfaces contracting the sleeve into clamping engagement with an inserted conduit when drawn axially through the action of thescrew and the sleeve havingan axial slot extending from its outer end inwardly and" a circumferential slot extending from the axial slot, the inner'end of the sleeve having a radially inwardly extending guard should 'I' nit,

der presenting a continuous-inner wall.

5. A contractible sleeve for conduit fittings, said sleeve being ext-eriorally screwthreaded at its smaller end and having a continuous annular lead surface at its inner end and provided with a circumferential slot toward its inner end with an axially extending. slot extending from the circumferential slot through its outer end, said slots making -the-. 'art o'f.the 'sleeve through which the axia slot extends contractible and adapted to czlamp, when contracted, an inserted condui with the continuous lead surface in advance of the end of the conduit.

Q16. A contractible sleeve for conduit fittings,; saidsleeve bein exteriorally screwth'readed at itssmaller end and having a continuous annular lead surface at its inner end, said lead surface being arranged at the {inner periphery of a radially inwardly extending guard shoulder and "a circumferential'slot extending along the guard shoulder with an axially extending slot extending from the circumferential slot through the outer end of the" sleeve, said slot making .aid sleeve cont-ractible and adapted to clamp, when-contracted, an inserted conduit with a continuous lead surface and guard shoulder in advance of the end of the con:

In, testimony whereof 'I have hereunto set my hand.

HOWARD A. 

